Abstract: An improved eyepiece for a viewfinder of a single lens reflex camera is provided. This improved eyepiece includes a negative first lens element and a positive second lens element with an air space formed between the first and second lens elements. The second lens element has an aspheric surface at its object side. The configuration of the aspheric surface is a hyperboloid of revolution.

Abstract: A light measuring device for a single lens reflex camera includes a principal or main mirror capable of dividing light passing through an objective lens towards a finder system and towards a film plane. A submirror is provided behind the main mirror and directs the light passed therethrough towards the film plane for ultimately determining a focusing condition and a measurement of light intensity. A pair of focus detecting photosensor arrays, as well as a spotlight measuring photocell, is arranged relative to the submirror to receive the object light. The auxiliary mirror can be formed with a center portion for reflecting the light through the photocell arrays and a second light-reflecting plane having light diffusive characteristics for directing light for the detection of light measurement.

Abstract: A metal-ceramics composite material is produced by forming a metal film comprised of three layers on a ceramic substrate, and laminating a metal member thereon, the metal film comprising first layer of Group IV a metal, second layer of Group VIa metal and third layer of Group Ib metal, wherein the first and second layers are formed by gas deposition technique and the Group Ib layer may be formed by gas deposition technique or electrochemical plating. An additional Group VIII metal layer may be interposed between Group VIa layer and Group Ib layer by gas deposition technique.

Abstract: An electric wire is wound as coil turns in slots in electric rotating machinery component such as a stator or an armature. The wire as it is supplied from a nozzle or flyer is guided by movable formers into successive layers of coil turns in the slots without forming an unwanted dead space in the slots. The formers are moved in radial increments to provide successive spaces in the slots for allowing the successive coil turn layers to be neatly laid in the spaces.

Abstract: A mirror arrangement for use in a single lens reflex camera which divides a light transmitted through an objective lens of the camera into a first portion led to a viewfinder and a second portion led to a light receptor which detects a focusing condition of the objective lens or the like, is disclosed. The mirror arrangement comprises a total reflection mirror surface and a plurality of light transmitting slits arranged thereon in parallel to each other. A width of each slit is limited less than 80.mu.. Pitches between two adjacent slits in the width direction are over than two times of an average width of all slits, and have at least two different values.

Abstract: Coke deposited within the gas passages of a dual tower type, fluidized bed apparatus for thermally cracking hydrocarbon oils is removed by combustion through contact with a stream of an oxygen-containing, high temperature combustion gas without a need to disjoint the apparatus. The apparatus is comprised of heating and cracking towers each adapted for containing a mass of fluidized solid particles continuously recirculating between the two towers. In one embodiment, all of the solid particles are discharged from the apparatus and a stream of the oxygen-containing combustion gas, produced in a combustion furnace connected to the heating tower, is allowed to pass through the gas passages.

Abstract: Thermophilic aspartase is produced by culturing a microorganism belonging to the genus Bacillus. The enzyme is useful as a catalyst in the production of L-aspartic acid from ammonium fumarate or a mixture of fumaric acid and ammonia.

Abstract: An optical system for a viewfinder camera is provided. The objective lens system is divided into at least two separate lens groups. The first lens group provides an insufficient correction to aberration while the second lens group is designed specifically to correct the aberration transmitted through the first lens group. The complimentary viewfinder system is also likewise designed to correct the same aberration as the second lens group.

Abstract: A process for producing a magnetic metal powder having improved oxidation resistance and magnetic properties, which comprises wetting a magnetic metal powder in an atmosphere of a non-oxidizing gas with a solution of a boron trialkoxide in a solvent being inert to the magnetic metal powder and capable of dissolving the boron trialkoxide; and thereafter evaporating off the solvent.

Abstract: In an exposure control device for a camera wherein exposure is controlled in accordance with the scene object light reflected from the surfaces of a leading shutter curtain and a film, the error in exposure control due to the difference in reflecting power between the surfaces of the film and the leading shutter curtain is corrected on the basis of an integral value of the difference between the output of the light measuring circuit and the output of a delay circuit which delays the output of said light measuring circuit by a predetermined period of time.

Abstract: Optically active cephalosporin analogs are produced by an optically selective acylation reaction. The reaction is carried out in the presence of a microbial enzyme which catalyzes the selective optical acylation. The products thus obtained are useful as antibacterial agents.

Abstract: Optically active cephalosporin analogs are produced by optically selective deacylation of an optically inactive acylated analog. The compounds are useful as intermediates in the preparation of optically active acylated antimicrobial agents.

Abstract: A toothed belt having an endless rubber band formed with projecting tooth portions, the rubber band having tension members buried in parallel therein. A cloth cover is fastened to the toothed surface of the band. The cloth is formed of woven fibers, and one of the warp and woof fibers of the cloth has a high-adhesive characteristic, and has a greater exposed surface area on one side of the cloth, which side is fastened to the toothed surface. The other of the warp and woof is formed of a fiber having properties suited for the working environment, such as properties of abrasion resistance and low friction, these latter fibers having a greater exposed area on the other side of the cloth, which other side is positioned for engagement with a toothed pulley.

Abstract: Methylhydrazines are produced in high yield by reaction of trimethylanilinium halide with hydrazine or monomethylhydrazine at a reaction temperature of 80.degree. to 130.degree. C. for at least 3 hours.Methylhydrazines are useful compounds in the fields of chemical industry, such as manufacturing pharmaceuticals or agricultural chemicals, and space weapon industry.

Abstract: A pentagonal roof reflecting viewfinder assembly for a single lens reflex camera is provided. A focussing plate and a first and second reflecting mirror are part of the assembly. The improvement includes a third aspherical reflecting mirror having a lesser curvature at its marginal portions than adjacent an apex of the surface. The apex being positioned above the reflective surface of the third mirror. An ocular is provided having at least two lens elements with one of the lens elements being tilted relative to the optical axis of the ocular.

Abstract: A light measuring device for a camera with automatic exposure control is provided with a light responsive element and a light reflecting optical element, such as a mirror or a transparent block having a light reflecting surface, both elements being disposed outside of the light path from the objective lens to the focal plane for exposure of the film. The light reflecting optical element faces a certain area of the focal plane to receive the light reflected at the surface of the leading shutter member of a focal plane shutter device and/or the surface of the film. The light responsive element faces the optical element to receive the light reflected thereby.

Abstract: A thermoplastic elastomer composition consisting essentially of (A) 2 to 50% by weight of a polybutadiene having a 1,2-addition unit content of 70% or more, (B) 20 to 90% by weight of an olefinic rubber and (C) 5 to 60% by weight of a polyolefin resin, 30 to 95% by weight of the total polymer components, up to 90% by weight of said polybutadiene and up to 90% by weight of said olefinic rubber being soluble in Tetralin when the composition is heated at 210.degree. C for 3 hours in Tetralin under reflux. Said composition is excellent in mechanical strength, weather resistance, oil resistance, heat stability and processability and has a small permanent set.

Abstract: A compact camera contains a plurality of objective lenses which are selectively alternatively advanced by external manipulation into registry with the camera photographing optical axis to vary the image magnification. A view finder optical system is provided which includes a lens member which is movable into and out of registry with the view finder optical system to vary the viewer field to correspond to the field of the operative objective lens. A lens storage space is provided between the laterally spaced view finder and photographing optical axis, one of the objective lenses when retracted occupies the storage space and when this lens is advanced to the photographic optical axis it may be replaced in the storage space by the retracted view finder lens member.

Abstract: A nematic liquid crystal composition comprising (I) 4-n-valeryloxy-4'-cyanobiphenyl, (II) 4-n-caproyloxy-4'-cyanobiphenyl and (III) 4'-cyanophenyl-4-n-heptylbenzoate, and either (IV) 4'-cyanophenyl-4-n-butylbenzoate or (V) 4'-cyanophenyl-4-n-nonylbenzoate, said composition having a crystal-nematic transition temperature of -40.degree. to -20.degree. C and a nematic-isotropic transition temperature of 50.degree. to 65.degree. C.

Abstract: A light measuring device for use in a single lens reflex camera includes: a transparent block located in the rear and upward location of a pentagonal prism and having at least one surface serving as a reflecting surface; and a light receiving portion including a photoelectric element having a light receiving surface, which portion is located in the vicinity of such one surface of the prism, such that part of the scene light which as been transmitted through an objective lens and scattered through the front portion of a focussing plate located in the optical path of a viewfinder is introduced into the transparent block, then reflected on such reflecting surface and introduced to the light receiving surface of the photoelectric element, while part of the scene light scattering through the rear portion of the focussing plate is transmitted through the transparent block and is then introduced into the light receiving surface, whereby the light beams from the entire surface of the scene may be measured at a desire